He uses  plastic bag to wrap food.
I suggest he shouldn't use  plastic bag to wrap food.
2. His sister always turns on the lights when going to bed.
I suggest His sister shouldn't  turn on the lights when going to bed.
3. His car uses too much gas.
I suggest he should use less gas for His car
4. They often stay up late to watch TV.
I suggest they shouldn't stay up late to watch TV.
5. Her mother is too fat.
I suggest Her mother should eat less fast food